forked from OSchip/llvm-project
69 lines
2.6 KiB
LLVM
69 lines
2.6 KiB
LLVM
; This test sees if return values (and arguments) are properly removed when they
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; are unused. All unused values are typed i16, so we can easily check. We also
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; run instcombine to fold insert/extractvalue chains and we run dce to clean up
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; any remaining dead stuff.
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; RUN: opt < %s -deadargelim -instcombine -dce -S | not grep i16
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define internal {i16, i32} @test(i16 %DEADARG) {
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%A = insertvalue {i16,i32} undef, i16 1, 0
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%B = insertvalue {i16,i32} %A, i32 1001, 1
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ret {i16,i32} %B
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}
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define internal {i32, i16} @test2() {
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%DEAD = call i16 @test4()
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%A = insertvalue {i32,i16} undef, i32 1, 0
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%B = insertvalue {i32,i16} %A, i16 %DEAD, 1
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ret {i32,i16} %B
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}
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; Dead argument, used to check if the second result of test2 is dead even when
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; it's used as a dead argument
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define internal i32 @test3(i16 %A) {
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%ret = call {i16, i32} @test( i16 %A ) ; <i32> [#uses=0]
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%DEAD = extractvalue {i16, i32} %ret, 0
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%LIVE = extractvalue {i16, i32} %ret, 1
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ret i32 %LIVE
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}
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define internal i16 @test4() {
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ret i16 0
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}
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; Multiple return values, multiple live return values
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define internal {i32, i32, i16} @test5() {
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%A = insertvalue {i32,i32,i16} undef, i32 1, 0
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%B = insertvalue {i32,i32,i16} %A, i32 2, 1
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%C = insertvalue {i32,i32,i16} %B, i16 3, 2
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ret {i32, i32, i16} %C
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}
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; Nested return values
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define internal {{i32}, {i16, i16}} @test6() {
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%A = insertvalue {{i32}, {i16, i16}} undef, i32 1, 0, 0
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%B = insertvalue {{i32}, {i16, i16}} %A, i16 2, 1, 0
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%C = insertvalue {{i32}, {i16, i16}} %B, i16 3, 1, 1
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ret {{i32}, {i16, i16}} %C
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}
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define i32 @main() {
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%ret = call {i32, i16} @test2() ; <i32> [#uses=1]
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%LIVE = extractvalue {i32, i16} %ret, 0
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%DEAD = extractvalue {i32, i16} %ret, 1
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%Y = add i32 %LIVE, -123 ; <i32> [#uses=1]
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%LIVE2 = call i32 @test3(i16 %DEAD) ; <i32> [#uses=1]
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%Z = add i32 %LIVE2, %Y ; <i32> [#uses=1]
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%ret1 = call { i32, i32, i16 } @test5 ()
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%LIVE3 = extractvalue { i32, i32, i16} %ret1, 0
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%LIVE4 = extractvalue { i32, i32, i16} %ret1, 1
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%DEAD2 = extractvalue { i32, i32, i16} %ret1, 2
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%V = add i32 %LIVE3, %LIVE4
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%W = add i32 %Z, %V
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%ret2 = call { { i32 }, { i16, i16 } } @test6 ()
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%LIVE5 = extractvalue { { i32 }, { i16, i16 } } %ret2, 0, 0
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%DEAD3 = extractvalue { { i32 }, { i16, i16 } } %ret2, 1, 0
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%DEAD4 = extractvalue { { i32 }, { i16, i16 } } %ret2, 1, 1
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%Q = add i32 %W, %LIVE5
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ret i32 %Q
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}
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